package com.xxx.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.xxx.reggie.common.BaseContext;
import com.xxx.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //进行用户请求路径的比对,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        String[] uris = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
//                "/user/**",
//                "/front/**"
        };
        log.info("本次请求为:{}",requestURI);
        //2.判断本次请求是否需要处理
        boolean check = CheckUris(requestURI,uris);

        //3.如果不需要处理,则直接放行
        if (check){
            log.info("本次不需要处理的请求为:{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断后台登录状态,如果已登录,则直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录,用户的id->{}",request.getSession().getAttribute("employee"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断移动端登录状态,如果已登录,则直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录,用户的id->{}",request.getSession().getAttribute("user"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5.如果未登录则返回未登录结果,通过输出流对客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        return;
    }


    /**
     * 进行路径的匹配判断
     * @param requestUri
     * @param Uris
     * @return
     */
    public boolean CheckUris(String requestUri,String[] Uris){
        for (String s : Uris) {
            boolean match = PATH_MATCHER.match(s, requestUri);
            if(match){
                return true;
            }
        }
        return false;
    }
}
